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-rw-r--r--include/crypto/algapi.h293
1 files changed, 293 insertions, 0 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
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+++ b/include/crypto/algapi.h
@@ -0,0 +1,293 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Cryptographic API for algorithms (i.e., low-level API).
+ *
+ * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+#ifndef _CRYPTO_ALGAPI_H
+#define _CRYPTO_ALGAPI_H
+
+#include <linux/crypto.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+
+/*
+ * Maximum values for blocksize and alignmask, used to allocate
+ * static buffers that are big enough for any combination of
+ * algs and architectures. Ciphers have a lower maximum size.
+ */
+#define MAX_ALGAPI_BLOCKSIZE 160
+#define MAX_ALGAPI_ALIGNMASK 63
+#define MAX_CIPHER_BLOCKSIZE 16
+#define MAX_CIPHER_ALIGNMASK 15
+
+struct crypto_aead;
+struct crypto_instance;
+struct module;
+struct rtattr;
+struct seq_file;
+struct sk_buff;
+
+struct crypto_type {
+ unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
+ unsigned int (*extsize)(struct crypto_alg *alg);
+ int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
+ int (*init_tfm)(struct crypto_tfm *tfm);
+ void (*show)(struct seq_file *m, struct crypto_alg *alg);
+ int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
+ void (*free)(struct crypto_instance *inst);
+
+ unsigned int type;
+ unsigned int maskclear;
+ unsigned int maskset;
+ unsigned int tfmsize;
+};
+
+struct crypto_instance {
+ struct crypto_alg alg;
+
+ struct crypto_template *tmpl;
+
+ union {
+ /* Node in list of instances after registration. */
+ struct hlist_node list;
+ /* List of attached spawns before registration. */
+ struct crypto_spawn *spawns;
+ };
+
+ struct work_struct free_work;
+
+ void *__ctx[] CRYPTO_MINALIGN_ATTR;
+};
+
+struct crypto_template {
+ struct list_head list;
+ struct hlist_head instances;
+ struct module *module;
+
+ int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
+
+ char name[CRYPTO_MAX_ALG_NAME];
+};
+
+struct crypto_spawn {
+ struct list_head list;
+ struct crypto_alg *alg;
+ union {
+ /* Back pointer to instance after registration.*/
+ struct crypto_instance *inst;
+ /* Spawn list pointer prior to registration. */
+ struct crypto_spawn *next;
+ };
+ const struct crypto_type *frontend;
+ u32 mask;
+ bool dead;
+ bool registered;
+};
+
+struct crypto_queue {
+ struct list_head list;
+ struct list_head *backlog;
+
+ unsigned int qlen;
+ unsigned int max_qlen;
+};
+
+struct scatter_walk {
+ struct scatterlist *sg;
+ unsigned int offset;
+};
+
+void crypto_mod_put(struct crypto_alg *alg);
+
+int crypto_register_template(struct crypto_template *tmpl);
+int crypto_register_templates(struct crypto_template *tmpls, int count);
+void crypto_unregister_template(struct crypto_template *tmpl);
+void crypto_unregister_templates(struct crypto_template *tmpls, int count);
+struct crypto_template *crypto_lookup_template(const char *name);
+
+int crypto_register_instance(struct crypto_template *tmpl,
+ struct crypto_instance *inst);
+void crypto_unregister_instance(struct crypto_instance *inst);
+
+int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask);
+void crypto_drop_spawn(struct crypto_spawn *spawn);
+struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
+ u32 mask);
+void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
+
+struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
+int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
+const char *crypto_attr_alg_name(struct rtattr *rta);
+int crypto_attr_u32(struct rtattr *rta, u32 *num);
+int crypto_inst_setname(struct crypto_instance *inst, const char *name,
+ struct crypto_alg *alg);
+
+void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
+int crypto_enqueue_request(struct crypto_queue *queue,
+ struct crypto_async_request *request);
+void crypto_enqueue_request_head(struct crypto_queue *queue,
+ struct crypto_async_request *request);
+struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
+static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
+{
+ return queue->qlen;
+}
+
+void crypto_inc(u8 *a, unsigned int size);
+void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
+
+static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
+{
+ if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
+ __builtin_constant_p(size) &&
+ (size % sizeof(unsigned long)) == 0) {
+ unsigned long *d = (unsigned long *)dst;
+ unsigned long *s = (unsigned long *)src;
+
+ while (size > 0) {
+ *d++ ^= *s++;
+ size -= sizeof(unsigned long);
+ }
+ } else {
+ __crypto_xor(dst, dst, src, size);
+ }
+}
+
+static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
+ unsigned int size)
+{
+ if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
+ __builtin_constant_p(size) &&
+ (size % sizeof(unsigned long)) == 0) {
+ unsigned long *d = (unsigned long *)dst;
+ unsigned long *s1 = (unsigned long *)src1;
+ unsigned long *s2 = (unsigned long *)src2;
+
+ while (size > 0) {
+ *d++ = *s1++ ^ *s2++;
+ size -= sizeof(unsigned long);
+ }
+ } else {
+ __crypto_xor(dst, src1, src2, size);
+ }
+}
+
+static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
+{
+ return PTR_ALIGN(crypto_tfm_ctx(tfm),
+ crypto_tfm_alg_alignmask(tfm) + 1);
+}
+
+static inline struct crypto_instance *crypto_tfm_alg_instance(
+ struct crypto_tfm *tfm)
+{
+ return container_of(tfm->__crt_alg, struct crypto_instance, alg);
+}
+
+static inline void *crypto_instance_ctx(struct crypto_instance *inst)
+{
+ return inst->__ctx;
+}
+
+struct crypto_cipher_spawn {
+ struct crypto_spawn base;
+};
+
+static inline int crypto_grab_cipher(struct crypto_cipher_spawn *spawn,
+ struct crypto_instance *inst,
+ const char *name, u32 type, u32 mask)
+{
+ type &= ~CRYPTO_ALG_TYPE_MASK;
+ type |= CRYPTO_ALG_TYPE_CIPHER;
+ mask |= CRYPTO_ALG_TYPE_MASK;
+ return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
+}
+
+static inline void crypto_drop_cipher(struct crypto_cipher_spawn *spawn)
+{
+ crypto_drop_spawn(&spawn->base);
+}
+
+static inline struct crypto_alg *crypto_spawn_cipher_alg(
+ struct crypto_cipher_spawn *spawn)
+{
+ return spawn->base.alg;
+}
+
+static inline struct crypto_cipher *crypto_spawn_cipher(
+ struct crypto_cipher_spawn *spawn)
+{
+ u32 type = CRYPTO_ALG_TYPE_CIPHER;
+ u32 mask = CRYPTO_ALG_TYPE_MASK;
+
+ return __crypto_cipher_cast(crypto_spawn_tfm(&spawn->base, type, mask));
+}
+
+static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
+{
+ return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
+}
+
+static inline struct crypto_async_request *crypto_get_backlog(
+ struct crypto_queue *queue)
+{
+ return queue->backlog == &queue->list ? NULL :
+ container_of(queue->backlog, struct crypto_async_request, list);
+}
+
+static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
+{
+ return (algt->type ^ off) & algt->mask & off;
+}
+
+/*
+ * When an algorithm uses another algorithm (e.g., if it's an instance of a
+ * template), these are the flags that should always be set on the "outer"
+ * algorithm if any "inner" algorithm has them set.
+ */
+#define CRYPTO_ALG_INHERITED_FLAGS \
+ (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \
+ CRYPTO_ALG_ALLOCATES_MEMORY)
+
+/*
+ * Given the type and mask that specify the flags restrictions on a template
+ * instance being created, return the mask that should be passed to
+ * crypto_grab_*() (along with type=0) to honor any request the user made to
+ * have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
+ */
+static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
+{
+ return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
+}
+
+noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
+
+/**
+ * crypto_memneq - Compare two areas of memory without leaking
+ * timing information.
+ *
+ * @a: One area of memory
+ * @b: Another area of memory
+ * @size: The size of the area.
+ *
+ * Returns 0 when data is equal, 1 otherwise.
+ */
+static inline int crypto_memneq(const void *a, const void *b, size_t size)
+{
+ return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
+}
+
+int crypto_register_notifier(struct notifier_block *nb);
+int crypto_unregister_notifier(struct notifier_block *nb);
+
+/* Crypto notification events. */
+enum {
+ CRYPTO_MSG_ALG_REQUEST,
+ CRYPTO_MSG_ALG_REGISTER,
+ CRYPTO_MSG_ALG_LOADED,
+};
+
+#endif /* _CRYPTO_ALGAPI_H */